爆炸荷载下考虑初始损伤的SRC框架多维连续倒塌研究综述

Review on Multi-Dimensional Progressive Collapse of SRC Frames with Initial Damage under Blast Loads

摘要: 钢骨混凝土(SRC)框架兼具型钢与钢筋混凝土材料优势，承载力、变形能力与抗震性能突出，广泛应用于高层民用建筑及关键公共基础设施。但爆炸等突发偶然荷载易造成底层边柱等竖向承重构件受损或局部失效，结构传力路径被迫重分布，进而引发损伤持续扩散，最终产生与初始破坏程度严重不匹配的大范围整体坍塌，即连续倒塌现象。现阶段国内外针对爆炸作用下结构抗连续倒塌的研究持续增多，但现有成果多围绕普通钢筋混凝土框架或纯钢框架展开，针对多材料耦合受力的SRC体系研究仍较为有限；尤其缺少结合爆炸真实损伤形态、多维耦合倒塌全过程的系统性分析，相关基础科学问题仍有待进一步完善。基于此，本文系统梳理爆炸荷载下SRC框架连续倒塌相关研究进展，总结现有分析手段、损伤演化规律、结构鲁棒性评价方法，指出当前研究存在的短板，明确后续研究重点，为SRC结构抗爆、抗连续倒塌精细化设计提供理论参考。

Abstract: Steel reinforced concrete (SRC) frames integrate the material advantages of section steel and reinforced concrete, with excellent bearing capacity, ductility and seismic performance, which have been widely adopted in high-rise buildings and vital infrastructure. Nevertheless, accidental extreme loads such as explosions may lead to local damage or failure of vertical load-bearing components (e.g., bottom edge columns), triggering internal force redistribution and continuous damage propagation, and eventually induce catastrophic progressive collapse disproportionate to the initial local failure. In recent years, scholars have paid increasing attention to the progressive collapse resistance of structures under blast loads. However, most existing studies focus on reinforced concrete (RC) frames or pure steel frames, while investigations on SRC structures with complex composite mechanical behaviors are insufficient. In particular, systematic research considering realistic blast-induced initial damage and multi-dimensional coupled collapse mechanisms remains insufficient, and many key scientific problems need to be further explored. This paper comprehensively reviews the research progress of progressive collapse of SRC frames subjected to blast loads, summarizes mainstream analysis methods, damage evolution rules and structural robustness evaluation systems, identifies the deficiencies of current research, and puts forward prospective research directions. The review can provide theoretical support for refined anti-blast and anti-progressive collapse design of SRC structures.